public class e4_9{
  public static void main(String args[]){
    SIM simone = new SIM(13889776509l);
    MobileTelephone mobile = new MobileTelephone();
    mobile.setSIM(simone);
    System.out.println("手机号码:"+mobile.lookNumber());
    SIM simtwo = new SIM(15967563567L);
    mobile.setSIM(simtwo);
   System.out.println("手机号码:"+mobile.lookNumber());
  }
}
